Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

Morandi, Omar; Hervieux, Paul-Antoine; Manfredi, Giovanni

doi:10.1103/physrevb.81.155309

Cited by 18 publications

(25 citation statements)

References 19 publications

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“…17,18 Studies of the doping process in LECs encounter a crucial lack of the fundamental understanding with only a few theoretical papers addressing the subject. 14,[19][20][21][22] In particular, the analytical formula for the velocity of a planar doping front has been found only recently in Ref.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

et al. 2012

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Recently, it was demonstrated that electrochemical doping fronts in organic semiconductors exhibit a new fundamental instability growing from multidimensional perturbations [Bychkov et al., Phys. Rev. Lett. 107, 016103 (2011)]. In the instability development, linear growth of tiny perturbations goes over into a nonlinear stage of strongly distorted doping fronts. Here we develop the nonlinear theory of the doping front instability and predict the key parameters of a corrugated doping front, such as its velocity, in close agreement with the experimental data. We show that the instability makes the electrochemical doping process considerably faster. We obtain the self-similar properties of the front shape corresponding to the maximal propagation velocity, which allows for a wide range of controlling the doping process in the experiments. The developed theory provides the guide for optimizing the performance of organic optoelectronic devices such as light-emitting electrochemical cells.

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

et al. 2012

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“…Experimental and technical activities on the subject are extremely high [4][5][6][7], although further development of organic electronics requires a much better fundamental understanding of the complex OSC plasma dynamics: electrons, holes, and positive and negative ions immersed in an electrolyte. Though much theoretical work has been performed on plasmas in conventional inorganic semiconductors, e.g., [8,9], for OSCs such understanding is far from being adequate. The key phenomenon is the doping transformation accompanied by significant changes in important material properties: conductivity, color, volume, etc.…”

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confidence: 99%

Speedup of Doping Fronts in Organic Semiconductors through Plasma Instability

et al. 2011

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The dynamics of doping transformation fronts in organic semiconductor plasma is studied for application in light-emitting electrochemical cells. We show that new fundamental effects of the plasma dynamics can significantly improve the device performance. We obtain an electrodynamic instability, which distorts the doping fronts and increases the transformation rate considerably. We explain the physical mechanism of the instability, develop theory, provide experimental evidence, perform numerical simulations, and demonstrate how the instability strength may be amplified technologically. The electrodynamic plasma instability obtained also shows interesting similarity to the hydrodynamic Darrieus-Landau instability in combustion, laser ablation, and astrophysics.

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“…As initial state we take the equilibrium state obtained by fixing the temperature of the system. We excite the system by rising instantaneously the temperature of the electron gas [27,28,29,30]. This simulate the excitation of the system by an intense and short laser pulse.…”

Section: Numerical Resultsmentioning

confidence: 99%

Quantum Stochastic Model for Spin Dynamics in Magnetic Systems

Morandi¹

2019

CiCP

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We develop a numerical model that reproduces the thermal equilibrium and the spin transfer mechanisms in magnetic nanomaterials. We analyze the coherent two-particle spin exchange interaction and the electron-electron collisions. Our study is based on a quantum atomistic approach and the particle dynamics is performed by using a Monte Carlo technique. The coherent quantum evolution of the atoms is interrupted by instantaneous collisions with itinerant electrons. The collision processes are associated to the quantum collapse of the local atomic wave function. We show that particle-particle interactions beyond the molecular field approximation can be included in this framework.Our model is able to reproduce the thermal equilibrium and strongly out-ofequilibrium phenomena such as the ultrafast dynamics of the magnetization in nanomatrials.

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Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

Cited by 18 publications

References 19 publications

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

Speedup of Doping Fronts in Organic Semiconductors through Plasma Instability

Quantum Stochastic Model for Spin Dynamics in Magnetic Systems

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